GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Dogwatch , n. (Naut.) A half watch; a watch of two hours, of which there are two, the first dogwatch from 4 to 6 o'clock, p. m., and the second dogwatch from 6 to 8 o'clock, p. m.
   Totten.
   
   1913 Webster